A novel cobweb-like sub-grain structured Al-Cu-Mg alloy with high strength-plasticity synergy

doi:10.1016/j.ijplas.2024.104178

IMR OpenIR

	A novel cobweb-like sub-grain structured Al-Cu-Mg alloy with high strength-plasticity synergy
	Song, Yufeng 1; Zhang, Qin 1; Li, Heng 3; Yuan, Xudong 4; Chen, Yuqiang 1; Lu, Dingding 1; Liu, Wenhui 1,2
通讯作者	Lu, Dingding(ludingding@hnust.edu.cn) ; Liu, Wenhui(lwh@jmu.edu.cn)
	2025
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
ISSN	0749-6419
卷号	184 页码:36
摘要	Al-Cu-Mg alloys, as the most widely used lightweight structural materials, have been recognized as promising candidates in the transportation field for a low-carbon economy. However, the tensile strength and plasticity of alloys cannot be simultaneously improved to satisfy the requirements of continuously upgraded transportation vehicles. In this work, inspired by hightensile strength and high plasticity of cobweb structure, a novel cobweb-like sub-grain structure was developed in Al-Cu-Mg alloys by a successive solution, high-strain-rate rolling (4.4 s-1), cryogenic treatment (-196 degrees C) and aging process (SRCA). Notably, the tensile strength and plasticity of this alloy were superior to those reported in the current study. An ultrahigh Vickers hardness and tensile strength value of 206.2 Hv and 619.6 MPa, which were 39.8 % and 31.8 % higher than those of traditional T6 heat-treated Al-Cu-Mg alloys, were obtained after SRCA. Meanwhile, an increase in the elongation of this alloy from 4.31 % to 8.23 % (increase of 90.9%) was also achieved. More importantly, the high strength-plasticity ("double high") Al-Cu-Mg alloy was attributed to a cobweb-like sub-grain structure, which was proposed for the first time by utilizing reverse thinking to enhance plasticity through elevating dislocations, due to the formation of high-density dislocations from high-strain-rate rolling and rearrangement effect of dislocations from cryogenic treatment. Furthermore, the strength-plasticity mechanism was verified using in-situ tensile electron back scatter diffraction (EBSD), molecular dynamics (MD) simulations, and crystal plasticity (CP) models. The results indicated that the cobweb-like subgrain structure, resembling countless walls, formed barriers that hindered dislocation migration towards high-angle grain boundaries (HAGBs) and absorbed them, thereby reducing the occurrence of stress concentration zones, i.e., the dislocation absorption and stress-strain sharing mechanisms. Additionally, the strengthening mechanism was associated with synergistic strengthening by multiscale microstructures, including micron-sized grains, micron-sized highdensity dislocation lattices, and nanosized Al2CuMg phases, which were activated by successive deformation processes. Consequently, the concept of biomimetic structure design, which may serve as an effective method for achieving structural materials with high strength-plasticity synergy, can be extended to transportation fields, such as railway tracks and body structure design.
关键词	Cobweb-like sub-grain structure Tensile strength Plasticity Al-Cu-Mg alloy
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Hunan Province, China
DOI	10.1016/j.ijplas.2024.104178
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52375332] ; National Natural Science Foundation of China[U21A20130] ; National Natural Science Foundation of China[52005177] ; Natural Science Foundation of Hunan Province, China[2024JJ4020]
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS记录号	WOS:001360021100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/191693
专题	中国科学院金属研究所
通讯作者	Lu, Dingding; Liu, Wenhui
作者单位	1.Hunan Univ Sci & Technol, Xiangtan 411201, Peoples R China 2.Jimei Univ, Sch Marine Equipment & Mech Engn, Xiamen 361021, Peoples R China 3.Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China 4.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Song, Yufeng,Zhang, Qin,Li, Heng,et al. A novel cobweb-like sub-grain structured Al-Cu-Mg alloy with high strength-plasticity synergy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2025,184:36.
APA	Song, Yufeng.,Zhang, Qin.,Li, Heng.,Yuan, Xudong.,Chen, Yuqiang.,...&Liu, Wenhui.(2025).A novel cobweb-like sub-grain structured Al-Cu-Mg alloy with high strength-plasticity synergy.INTERNATIONAL JOURNAL OF PLASTICITY,184,36.
MLA	Song, Yufeng,et al."A novel cobweb-like sub-grain structured Al-Cu-Mg alloy with high strength-plasticity synergy".INTERNATIONAL JOURNAL OF PLASTICITY 184(2025):36.